CN115338432A

CN115338432A - Metal powder reciprocating spraying device and method for 3D printing

Info

Publication number: CN115338432A
Application number: CN202210798562.XA
Authority: CN
Inventors: 武彦飞; 杨海西; 崔栋梁; 姚淑英; 尉念伦
Original assignee: Hebei Jingye Additive Material Manufacturing Technology Co ltd
Current assignee: Hebei Jingye Additive Material Manufacturing Technology Co ltd
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2022-11-15

Abstract

The invention discloses a metal powder reciprocating spraying device and a metal powder reciprocating spraying method for 3D printing, relates to the technical field of 3D printing, and aims to solve the problems of adjustment of the transverse direction, the longitudinal direction and the height of the spraying device in printing. This metal powder spraying device that reciprocates for 3D prints and method thereof, drive the slide bar after first rotating electrical machines starts and rotate, the slide bar drives the slider through the slide bar screw thread after rotating and removes on the slide bar, drive the rotation axis after the second rotating electrical machines starts and rotate, the gear is connected with the tooth of activity inslot wall both sides installation, make the gear carry out lateral shifting at the tooth after the rotation axis rotates, make the threaded rod rotate after the lift motor starts, the threaded rod drives the linking piece through the external screw thread and carries out the adjustment of height after rotating, the nozzle prints the printing material of operation panel upper end after the height adjustment finishes, the metal powder that the spraying came out can be faster inhales to the box inner chamber through wind-force, it can be better to filter the powder to filter the cotton.

Description

Metal powder reciprocating spraying device and method for 3D printing

Technical Field

The invention relates to the technical field of 3D printing, in particular to a metal powder reciprocating spraying device and a metal powder reciprocating spraying method for 3D printing.

Background

3D printing is a technique that uses bondable materials, such as powdered metals or plastics, to build objects by layer-by-layer printing. The existing 3D printing also has the following problems when spraying metal powder:

1. when the metal powder is sprayed, the spraying material is required to be adjusted in different directions through the device, the best spraying effect can be achieved after the adjustment, the existing device for adjusting the direction of the spraying device is single, and only longitudinal or transverse adjustment can be performed, so that the spraying quality is reduced.

2. A large amount of metal powder can be generated during spraying, and the metal powder is not well collected and treated, so that the surrounding environment is polluted, and the health of workers is also unfavorable.

Disclosure of Invention

The invention aims to provide a metal powder reciprocating spraying device for 3D printing and a method thereof, wherein a first rotating motor drives a sliding rod to rotate after being started, the sliding rod drives a sliding block to move on the sliding rod through a sliding rod thread after rotating, a second rotating motor drives a rotating shaft to rotate after being started, a gear is connected with tooth teeth arranged on two sides of the inner wall of a movable groove, the gear moves transversely on the tooth teeth after the rotating shaft rotates, a lifting motor rotates a threaded rod after being started, the threaded rod drives a connecting block to adjust the height through an external thread after rotating, a nozzle prints a printing material at the upper end of an operating plate after the height adjustment is finished, sprayed metal powder can be sucked into an inner cavity of a box body through wind power more quickly, and filter cotton can better filter the powder, so that the problems in the prior art can be solved.

In order to achieve the purpose, the invention provides the following technical scheme:

a metal powder reciprocating spraying device for 3D printing comprises a workbench, a transverse moving device, a longitudinal moving device, a lifting device and a cleaning box, wherein an operation plate is installed at the top end of the workbench, a plurality of groups of waste material holes are formed in the operation plate, the longitudinal moving device is installed on each of two sides of the operation plate, and the transverse moving device is installed at the upper end of the longitudinal moving device;

the transverse moving device is provided with a lifting device, the bottom end of the workbench is provided with a cleaning box, the cleaning box is communicated with a waste hole formed in the operating plate, and the corners of the bottom end of the workbench are respectively provided with a support leg.

Preferably, the longitudinal moving device comprises a mounting block, the mounting block is respectively mounted at the upper end of the workbench, two ends of the sliding rod are connected with the inner wall of the mounting block, sliding rod threads are formed in the sliding rod, the sliding rod penetrates through the sliding block to be in threaded connection, the sliding block can perform reciprocating motion through the sliding rod, a bolt hole is formed in the top end of the sliding block, and one end of the first rotating motor penetrates through the mounting block to be connected with the sliding rod.

Preferably, the lateral shifting device comprises a supporting frame, the supporting frame is shaped like an 'N' shape, fixing pieces are arranged on two sides of the bottom end of the supporting frame respectively, the supporting frame is connected with the fixing pieces through fixing bolts, a movable groove is formed in the top end of the supporting frame, multiple sets of teeth are arranged on two sides of the inner wall of the movable groove, baffles are arranged on two sides of the movable groove, a clamping block is clamped at the upper end of the movable groove, and the baffles limit the clamping block.

Preferably, a second rotating motor is installed at the upper end of the clamping block, a rotating shaft is arranged at the bottom end of the second rotating motor, the rotating shaft penetrates through the upper end of the clamping block and extends to the bottom end of the clamping block to be connected with the shaft rod in a shaft mode, the gear is sleeved into the outer wall of the shaft rod, the bottom end of the shaft rod is installed in the shaft sleeve, the shaft sleeve is installed at the upper end of the bottom block, the gear is connected with teeth installed on two sides of the inner wall of the movable groove in a meshed mode, and a lifting device is installed at the bottom end of the bottom block.

Preferably, elevating gear includes the stand, and the stand groove has been seted up to the stand outer wall, and the threaded rod is installed to the stand inslot, and the threaded rod outer wall sets up the multiunit external screw thread, stand side-mounting snap ring, stand top corner are provided with the fixed column respectively, and elevator motor one end is passed the stand upper end and is extended to the stand groove and be connected with the threaded rod upper end, and the installation links up the piece on the threaded rod, links up and sets up the internal thread on the piece.

Preferably, join the piece and carry out threaded connection through external screw thread and internal thread with the threaded rod, join piece one end and be connected with coupling assembling one end, coupling assembling upper end installation storage pipe has seted up the powder pipe hole on the storage pipe, and the nozzle is installed to the coupling assembling bottom.

Preferably, a box inner cavity is formed in the cleaning box, a front door is installed on the front wall of the cleaning box and can be opened and closed through a hinge, the two sides of the inner wall of the box inner cavity are respectively provided with an exhaust fan, a clamping groove is formed below the exhaust fan, the two sides of the exhaust plate are provided with an exhaust block, and the exhaust blocks are installed in the clamping grooves and can be pulled and pulled.

Preferably, the exhaust fan includes set casing, filter pulp, fan axle, flabellum and inner shell, and set casing one end is passed the cleaning box outer wall and is extended to the box inner chamber, and the set casing intussuseption is filled with filter pulp, and set casing one end is connected with inner shell one end, and fan axle one end and inner shell inner wall are connected, and fan axle outer wall a week installs multiunit flabellum.

The invention provides another technical scheme, and a method of a metal powder reciprocating spraying device for 3D printing comprises the following steps:

the first step is as follows: firstly, printing materials are placed at the upper end of an operation plate, a longitudinal moving device is started after the printing materials are placed, and the longitudinal moving device is moved to a longitudinal position suitable for the printing materials through an external control device after the longitudinal moving device is started;

the second step is that: after the longitudinal position of the printing material is determined, starting a transverse moving device, and moving the transverse moving device to a transverse position suitable for the printing material through an external control device after the transverse moving device is started;

the third step: after the transverse position of the printing material is determined, the height of the printing material is adjusted through the lifting device, spraying work can be carried out after the adjustment is finished, and the longitudinal direction, the transverse direction and the height can be adjusted according to the printing requirement;

the fourth step: the metal powder can leak into the cleaning box when spraying, and the cleaning box can collect and filter the metal powder.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention provides a metal powder reciprocating spraying device for 3D printing and a method thereof, wherein a first rotating motor drives a sliding rod to rotate after being started, the sliding rod can drive a sliding block to move on the sliding rod through a sliding rod thread after rotating, a transverse moving device is installed at the upper end of the sliding block, when the sliding block moves to a longitudinal position suitable for printing materials, the first rotating motor can be controlled to stop working through an external controller, a second rotating motor can drive a rotating shaft to rotate after being started, a gear is connected with tooth teeth installed on two sides of the inner wall of a movable groove, the gear transversely moves on the tooth teeth after the rotating shaft rotates, when the sliding block moves to the transverse position suitable for printing materials, the second rotating motor can be controlled to work through the external controller, the intelligent transverse and longitudinal movement operation enables the operation of workers to be more convenient, the spraying quality is improved, and the working duration is shortened.

2. The invention provides a metal powder reciprocating spraying device and a metal powder reciprocating spraying method for 3D printing, wherein a lifting motor can rotate a threaded rod after being started, the threaded rod drives a connecting block to adjust the height through external threads after rotating, a nozzle can print a printing material at the upper end of an operating plate after the height adjustment is finished, meanwhile, a conveying pipe for conveying metal powder can penetrate through a clamping ring and then extend to a powder pipe hole, and when the transverse and longitudinal reciprocating motion is adjusted, the height adjustment is improved, so that the spraying operation is not limited.

3. The invention provides a metal powder reciprocating spraying device and a metal powder reciprocating spraying method for 3D printing, wherein fan blades can suck air after being started and rotated by a fan shaft, sprayed metal powder can be sucked into an inner cavity of a box body more quickly by wind power, the powder can be better filtered by filter cotton while the air is sucked, the filter cotton is made of non-woven fabric filter cotton, the fiber tissue of the non-woven fabric filter cotton is loose, the high porosity increases the impurity containing amount, metal powder particles can be effectively removed, larger metal powder particle impurities are intercepted on the surface of the fibers, and fine metal powder particles are caught in the deep layer of a filter material, so that the metal powder has higher filtering efficiency, the metal powder cannot pollute the external environment, the diffusion area of the metal powder is reduced, and the working environment of workers is better.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a longitudinal moving device according to the present invention;

FIG. 3 is a schematic diagram of a lateral shifting apparatus according to the present invention;

FIG. 4 is a schematic view of the gear mounting of the present invention;

FIG. 5 is an enlarged view of the invention at A;

FIG. 6 is a schematic view of the lifting device of the present invention;

FIG. 7 is a schematic view of a connection block mounting structure according to the present invention;

FIG. 8 is a schematic view of the internal structure of the cleaning box of the present invention.

In the figure: 1. a work table; 2. a lateral movement device; 211. a support frame; 212. a fixing sheet; 213. fixing the bolt; 214. a movable groove; 215. teeth; 216. a baffle plate; 217. a clamping block; 218. a second rotating electrical machine; 219. a rotating shaft; 220. a shaft lever; 221. a gear; 222. a shaft sleeve; 223. a bottom block; 3. a longitudinal moving device; 31. mounting blocks; 32. a slide bar; 33. a slide bar thread; 34. a slider; 35. a bolt hole; 36. a first rotating electrical machine; 4. a lifting device; 411. a column; 412. a column groove; 413. a threaded rod; 414. an external thread; 415. a snap ring; 416. fixing the column; 417. a lifting motor; 418. a joining block; 419. an internal thread; 420. a connection assembly; 421. a storage tube; 422. powder tube holes; 423. a nozzle; 5. cleaning the box; 51. an inner cavity of the box body; 52. an exhaust fan; 521. a stationary case; 522. filtering cotton; 523. a fan shaft; 524. a fan blade; 525. an inner shell; 53. a card slot; 54. a front door; 55. a drawing plate; 56. drawing the block; 6. an operation panel; 61. waste material holes; 7. a bracket leg.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to solve the problem that the longitudinal position of the conventional spray coating device is not convenient to move, which results in poor longitudinal printing effect, please refer to fig. 1-2, the embodiment provides the following technical solutions:

the utility model provides a reciprocal spraying device of metal powder for 3D prints, includes workstation 1, lateral shifting device 2, longitudinal movement device 3, elevating gear 4 and

clearance case

5, 1 top installation operation panel 6 of workstation has seted up multiunit waste material hole 61 on the operation panel 6, and longitudinal movement device 3 is installed respectively to 6 both sides of operation panel, and longitudinal movement device 2 is installed to 3 upper ends of longitudinal movement device, is provided with elevating gear 4 on the

lateral movement device

2, and 1 bottom installation clearance case 5 of workstation, the waste material hole 61 of seting up on clearance case 5 and the operation panel 6 communicate with each other, and 1 bottom corner of workstation is provided with support leg 7 respectively.

The longitudinal moving device 3 comprises mounting blocks 31, the mounting blocks 31 are respectively mounted at the upper end of the workbench 1, two ends of a sliding rod 32 are connected with the inner wall of the mounting block 31, sliding rod threads 33 are formed in the sliding rod 32, the sliding rod 32 penetrates through a sliding block 34 to be in threaded connection, the sliding block 34 can perform reciprocating motion through the sliding rod 32, a bolt hole 35 is formed in the top end of the sliding block 34, and one end of a first rotating motor 36 penetrates through the mounting blocks 31 to be connected with the sliding rod 32.

Specifically, when the printing material is placed in operation panel 6 upper end, start first rotating electrical machines 36, first rotating electrical machines 36 drives slide bar 32 after starting and rotates, slide bar 32 can drive slider 34 through slide bar screw thread 33 and move on slide bar 32 after rotating, slider 34 upper end installation lateral shifting device 2, when slider 34 removes the longitudinal position to being fit for the printing material, can control first rotating electrical machines 36 stop work through outside controller, can be better adjust the longitudinal position of printing material at any time according to the demand.

In order to solve the problem of adjusting the transverse position and the spraying height in the conventional spraying device, please refer to fig. 3 to 7, which provide the following technical solutions:

the transverse moving device 2 comprises a supporting frame 211, the supporting frame 211 is in an N shape, two sides of the bottom end of the supporting frame 211 are respectively provided with a fixing plate 212, the supporting frame 211 is connected with the fixing plate 212 through a fixing bolt 213, the top end of the supporting frame 211 is provided with a movable groove 214, two sides of the inner wall of the movable groove 214 are provided with a plurality of sets of teeth 215, two sides of the movable groove 214 are respectively provided with a baffle plate 216, a fixture block 217 is clamped at the upper end of the movable groove 214, the baffle plate 216 limits the fixture block 217, the upper end of the fixture block 217 is provided with a second rotating motor 218, the bottom end of the second rotating motor 218 is provided with a rotating shaft 219, the rotating shaft 219 penetrates through the upper end of the fixture block 217 and extends to the bottom end of the fixture block 217 to be connected with a shaft rod 220 in a shaft mode, the gear 221 is sleeved on the outer wall of the shaft rod 220, the bottom end of the shaft rod is installed in a shaft sleeve 222, the shaft sleeve 222 is installed at the upper end of a bottom block 223, the gear 221 is connected with the teeth 215 installed at two sides of the inner wall of the movable groove 214, and a lifting device 4 is installed at the bottom end of the bottom block 223.

Lifting device 4 includes stand 411, stand groove 412 has been seted up to the stand 411 outer wall, installation threaded rod 413 in the stand groove 412, threaded rod 413 outer wall sets up multiunit external screw thread 414, stand 411 one side installation snap ring 415, stand 411 top corner is provided with fixed column 416 respectively, elevator motor 417 one end is passed the stand 411 upper end and is extended to stand groove 412 and be connected with the threaded rod 413 upper end, installation linking block 418 on the threaded rod 413, interior thread 419 has been seted up on linking block 418, linking block 418 and threaded rod 413 carry out threaded connection through external screw thread 414 and interior thread 419, linking block 418 one end is connected with coupling assembling 420 one end, coupling assembling 420 upper end installation storage tube 421, powder pipe hole 422 has been seted up on storage tube 421, coupling assembling 420 bottom installation nozzle 423.

Specifically, the fixing plate 212 is L-shaped, the upper end of the fixing plate 212 is connected to the outer wall of the supporting frame 211 through the fixing bolt 213, the bottom end of the fixing plate 212 is connected to the sliding block 34 through the fixing bolt 213, the second rotating motor 218 can drive the rotating shaft 219 to rotate after being started, the gear 221 is connected to the teeth 215 installed on both sides of the inner wall of the movable groove 214, the gear 221 is made to move transversely on the teeth 215 after the rotating shaft 219 rotates, when the gear is moved to a transverse position suitable for printing materials, the second rotating motor 218 can be controlled to work through an external controller, the transverse position of the printing materials can be better adjusted at any time according to requirements, the lifting motor 417 is started at this time, the threaded rod 413 can be rotated after the lifting motor 417 is started, the threaded rod 413 drives the connecting block 418 through the external thread 414 to adjust the height, the nozzle 423 can print the printing materials on the upper end of the operating plate 6 after the height adjustment is completed, and the conveying pipe for conveying metal powder can pass through the snap ring 415 and then extend to the powder pipe hole 422.

In order to solve the problems of environmental pollution and health of workers caused by improper treatment of metal powder when the metal powder is used for printing a printing material, please refer to fig. 8, the following technical solutions are provided:

the cleaning box 5 is internally provided with a box inner cavity 51, the front wall of the cleaning box 5 is provided with a front door 54, the front door 54 can be opened and closed through a hinge, two sides of the inner wall of the box inner cavity 51 are respectively provided with an exhaust fan 52, a clamping groove 53 is formed below the exhaust fan 52, two sides of an exhaust plate 55 are provided with an exhaust block 56, the exhaust block 56 is arranged in the clamping groove 53 and can be exhausted, the exhaust fan 52 comprises a fixed shell 521, filter cotton 522, a fan shaft 523, fan blades 524 and an inner shell 525, one end of the fixed shell 521 penetrates through the outer wall of the cleaning box 5 and extends to the box inner cavity 51, the fixed shell 521 is filled with the filter cotton 522, one end of the fixed shell 521 is connected with one end of the inner shell 525, one end of the fan shaft 523 is connected with the inner wall of the inner shell 525, and a plurality of fan blades 524 are arranged on the outer wall of the fan shaft 523 in a circle.

Specifically, when nozzle 423 prints the material of printing, the metal powder of spraying out can fall into to box inner chamber 51 through waste material hole 61, flabellum 524 can induced draft through fan shaft 523 after starting to rotate simultaneously, the metal powder that the spraying came out can be faster through wind-force suction to box inner chamber 51 in, filter cotton 522 can be better filter the powder when induced drafting, make metal powder can not cause the pollution to outside environment, filter cotton 522 material adopts non-woven fabrics filter cotton, non-woven fabrics filter cotton fiber texture is loose, high void fraction has increased the dirty volume of holding of impurity, can clear away metal powder particle effectively, great metal powder particle impurity is held back at the fibre surface, and slight metal powder particle then is caught in the filter media deep layer, higher filtration efficiency has.

the first step is as follows: firstly, printing materials are placed at the upper end of the operation plate 6, the longitudinal moving device 3 is started after the placement is finished, the longitudinal moving device 3 is moved to the longitudinal position suitable for the printing materials through an external control device after the longitudinal moving device 3 is started, when the sliding block 34 is moved to the longitudinal position suitable for the printing materials, the first rotating motor 36 can be controlled to stop working through an external controller, and the longitudinal position of the printing materials can be better adjusted at any time according to requirements;

the second step is that: after the longitudinal position of the printing material is determined, the transverse moving device 2 is started, the transverse moving device 2 is moved to the transverse position suitable for the printing material through an external control device after the transverse moving device 2 is started, when the transverse moving device is moved to the transverse position suitable for the printing material, the second rotating motor 218 can be controlled to work through an external controller, and the transverse position of the printing material can be better adjusted at any time according to requirements;

the third step: after the transverse position of the printing material is determined, the height of the printing material is adjusted through the lifting device 4, the threaded rod 413 rotates and then drives the connecting block 418 through the external thread 414 to adjust the height, the nozzle 423 can print the printing material at the upper end of the operating plate 6 after the height adjustment is finished, spraying work can be performed after the adjustment is finished, and the longitudinal direction, the transverse direction and the height can be adjusted according to the printing requirement;

the fourth step: in metal powder can leak into cleaning box 5 in the spraying, cleaning box 5 can collect and filter metal powder, and the metal powder that the spraying came out can be faster through wind-force inhales to box inner chamber 51, filters what filter pulp 522 can be better when induced drafting filters the powder, makes metal powder can not cause the pollution to outside environment.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a reciprocal spraying device of metal powder for 3D prints, includes workstation (1), lateral shifting device (2), longitudinal movement device (3), elevating gear (4) and clearance case (5), its characterized in that: an operating plate (6) is installed at the top end of the workbench (1), a plurality of groups of waste material holes (61) are formed in the operating plate (6), longitudinal moving devices (3) are installed on two sides of the operating plate (6) respectively, and a transverse moving device (2) is installed at the upper end of each longitudinal moving device (3);

the automatic cleaning device is characterized in that a lifting device (4) is arranged on the transverse moving device (2), a cleaning box (5) is installed at the bottom end of the workbench (1), the cleaning box (5) is communicated with a waste hole (61) formed in the operating plate (6), and support legs (7) are respectively arranged at corners of the bottom end of the workbench (1).

2. The metal powder reciprocating spraying device for 3D printing as claimed in claim 1, wherein: longitudinal movement device (3) are including installation piece (31), install piece (31) and install respectively in workstation (1) upper end, and slide bar (32) both ends and installation piece (31) inner wall connection, slide bar screw thread (33) have been seted up on slide bar (32), slide bar (32) pass slider (34) and carry out threaded connection, and slider (34) can carry out reciprocating motion through slide bar (32), bolt hole (35) have been seted up on slider (34) top, first rotating electrical machines (36) one end is passed installation piece (31) and is connected with slide bar (32).

3. The metal powder reciprocating spraying device for 3D printing as claimed in claim 1, wherein: lateral shifting device (2) are including braced frame (211), braced frame (211) shape is "N" font, braced frame (211) bottom both sides are provided with stationary blade (212) respectively, braced frame (211) are connected through fixing bolt (213) with stationary blade (212), movable groove (214) have been seted up on braced frame (211) top, multiunit tooth (215) are installed to movable groove (214) inner wall both sides, baffle (216) are all installed to movable groove (214) both sides, fixture block (217) card is in movable groove (214) upper end, and baffle (216) are spacing to fixture block (217).

4. The metal powder reciprocating spraying device for 3D printing according to claim 3, wherein: the upper end of the clamping block (217) is provided with a second rotating motor (218), the bottom end of the second rotating motor (218) is provided with a rotating shaft (219), the rotating shaft (219) penetrates through the upper end of the clamping block (217) and extends to the bottom end of the clamping block (217) to be connected with the shaft rod (220) in a shaft mode, the gear (221) is sleeved on the outer wall of the shaft rod (220), the bottom end of the shaft rod (220) is installed in a shaft sleeve (222), the shaft sleeve (222) is installed at the upper end of the bottom block (223), the gear (221) is connected with teeth (215) installed on two sides of the inner wall of the movable groove (214) in a meshed mode, and the bottom end of the bottom block (223) is provided with a lifting device (4).

5. The metal powder reciprocating spraying device for 3D printing as claimed in claim 1, wherein: elevating gear (4) include stand (411), stand groove (412) have been seted up to stand (411) outer wall, install threaded rod (413) in stand groove (412), threaded rod (413) outer wall sets up multiunit external screw thread (414), stand (411) one side installation snap ring (415), stand (411) top corner is provided with fixed column (416) respectively, elevator motor (417) one end is passed stand (411) upper end and is extended to stand groove (412) and be connected with threaded rod (413) upper end, threaded rod (413) are gone up the installation and are linked up piece (418), link up and seted up internal thread (419) on piece (418).

6. The metal powder reciprocating spraying device for 3D printing according to claim 1, wherein: join piece (418) and threaded rod (413) and carry out threaded connection through external screw thread (414) and internal thread (419), join piece (418) one end and be connected with coupling assembling (420) one end, coupling assembling (420) upper end installation storage tube (421), seted up powder pipe hole (422) on storage tube (421), coupling assembling (420) bottom installation nozzle (423).

7. The metal powder reciprocating spraying device for 3D printing according to claim 1, wherein: a box inner cavity (51) is formed in the cleaning box (5), a front door (54) is installed on the front wall of the cleaning box (5), the front door (54) can move in an opening and closing mode through a hinge, the two sides of the inner wall of the box inner cavity (51) are respectively provided with an exhaust fan (52), a clamping groove (53) is formed in the lower portion of the exhaust fan (52), the two sides of a drawing plate (55) are provided with drawing blocks (56), and the drawing blocks (56) are installed in the clamping groove (53) and can move in a drawing mode.

8. The metal powder reciprocating spraying device for 3D printing according to claim 7, wherein: the exhaust fan (52) is including set casing (521), filter pulp (522), fan axle (523), flabellum (524) and inner shell (525), set casing (521) one end is passed and is cleared up case (5) outer wall and extend to box inner chamber (51), set casing (521) intussuseption is filled with filter pulp (522), set casing (521) one end is connected with inner shell (525) one end, fan axle (523) one end and inner shell (525) wall connection, fan axle (523) outer wall a week installation multiunit flabellum (524).

9. A method of a metal powder reciprocating spraying apparatus for 3D printing according to any one of claims 1 to 8, comprising the steps of:

the first step is as follows: firstly, printing materials are placed at the upper end of an operation plate (6), a longitudinal moving device (3) is started after the printing materials are placed, and the longitudinal moving device (3) is moved to a longitudinal position suitable for the printing materials through an external control device after the longitudinal moving device (3) is started;

the second step is that: after the longitudinal position of the printing material is determined, starting the transverse moving device (2), and after the transverse moving device (2) is started, moving the transverse moving device (2) to a transverse position suitable for the printing material through an external control device;

the third step: after the transverse position of the printing material is determined, the height of the printing material is adjusted through the lifting device (4), spraying work can be carried out after the adjustment is finished, and the longitudinal direction, the transverse direction and the height can be adjusted according to the printing requirement;

the fourth step: the metal powder can leak into the cleaning box (5) when spraying, and the cleaning box (5) can collect and filter the metal powder.